{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-3KB40-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-3KB40-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-3KB40-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3KB40-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1025-3KB40-ZX95, 24 V DC coil with integrated varistor, screw-type terminals, 45 mm width, 100 mm depth.","salesMarkdown":"The coil is 24 V DC with a built-in varistor surge suppressor, which means you don't need to add an external suppression module across the coil terminals. That saves a wiring step and a part on the BOM. The contactor's main contacts are rated for motor switching: at AC-3 duty (standard squirrel-cage motors) at 400 V, it handles 5.5 kW; at AC-4 (plugging/reversing) at 400 V, it handles 15.5 A. The AC-3 figure is the one you size against for normal motor starting — the AC-4 figure matters if the application does frequent inching or reversing. For resistive loads (AC-1), the contactor is rated 10 A at 230 V and 6 A at 400 V. If you're switching heaters or lighting banks, use the AC-1 column, not the motor column. The coil draws 4.2 W holding power, same as pick-up, so the DC supply needs to deliver that continuously. That's a steady-state load on the 24 V bus — factor it into your power budget. Width is 45 mm, depth 100 mm, height 88 mm. Side-by-side mounting is allowed with no derating gap. Main circuit terminals accept screw-type connections: 2x (1 to 2.5 mm²) solid/stranded, or 2x (2.5 to 6 mm²), or max 2x 10 mm². Coil terminals accept 2x (0.25 to 2.5 mm²) solid. That covers standard panel wire sizes up to 10 mm² on the power side. IP20 on the front, IP00 at the terminals — so the terminal area is not finger-safe. The contactor needs to be inside a locked enclosure or behind a panel door.","metaTitle":"Siemens 3RT1025-3KB40-ZX95 SIRIUS Power Contactor, Size S0","metaDescription":"Siemens 3RT1025-3KB40-ZX95 SIRIUS power contactor, size S0, 45 mm wide, 24 V DC coil with varistor, screw terminals. Current production. Sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"88 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-scale value":"1.25","Size of contactor":"S0","Product brand name":"SIRIUS","Degree of pollution":"3","Product designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"10 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"0","Side-by-side mounting":"Yes","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"7.5 kW","at AC-4 at 400 V rated value":"15.5 A","Design of the surge suppressor":"with varistor","Closing power of magnet coil at DC":"4.2 W","Holding power of magnet coil at DC":"4.2 W","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","Reference code acc. to DIN EN 81346-2":"Q","Number of NC contacts for main contacts":"0","Number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","at ambient temperature 40 °C rated value":"40 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type of voltage of the control supply voltage":"DC","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=99774&mlfb=3RT1025-3KB40-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3KB40-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT1025-3KB40-ZX95?","answer":"The depth is 100 mm, width 45 mm, height 88 mm. It mounts on 35 mm DIN rail with side-by-side mounting allowed."},{"question":"What wire sizes does the 3RT1025-3KB40-ZX95 accept on the main contacts?","answer":"Main terminals accept 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm² solid/stranded. Coil terminals accept 2x (0.25 to 2.5 mm²) solid."},{"question":"Does the 3RT1025-3KB40-ZX95 come with a built-in surge suppressor?","answer":"Yes, the coil has an integrated varistor surge suppressor. No external suppression module is needed across the coil terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-3KB40-ZX95","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RT1025-3KB40-ZX95 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}